As Japan's Honda Motor pays hundreds of millions of dollars to replace potentially deadly air bags, hitting earnings, a new headache lies around the bend - cheaper U.S. petrol could lure buyers away from its fuel-efficient cars.

The country's third-largest automaker reports income for the October-December quarter later on Friday that analysts see falling 17 percent from a year earlier, squeezed by the cost of voluntary recalls involving air bag inflators made by top supplier Takata. The hit may be enough to trigger a full-year profit warning.